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Diglyme‐Based Thermoelectrochemical Cells Operable at Both Subzero and Elevated Temperatures
Author(s) -
Kim Kyunggu,
Lee Hochun
Publication year - 2019
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201900857
Subject(s) - diglyme , tec , electrolyte , atmospheric temperature range , lithium (medication) , ionic liquid , aqueous solution , materials science , chemistry , redox , analytical chemistry (journal) , inorganic chemistry , thermodynamics , electrode , organic chemistry , physics , catalysis , solvent , medicine , ionosphere , astronomy , endocrinology
Thermoelectrochemical cells (TECs) are promising devices for harvesting low‐grade waste heat (<200 °C). Most TEC researches have thus far focused on aqueous redox couples, but aqueous solutions suffer from a limited operating temperature range (0–100 °C). Herein, TECs based on nonaqueous Li + /Li redox couples (Li‐TECs) using diglyme (2G) electrolytes featuring a wide liquidus range (from −64 to 162 °C) are introduced. Notably, a Li‐TEC with 1.8 m lithium bis(fluorosulfonyl)imide (LiFSI) 2G surpasses the current best nonaqueous TECs based on ionic liquid (IL) electrolytes at elevated temperatures: 30% higher output power for cold side temperature ( T cold ) and hot side temperature ( T hot ) of 60 and 130 °C, respectively. In addition, unlike the TECs using ILs, the Li‐TEC displays stable operation even at T cold of −25 °C, which, for T hot of 150 °C, yields an unprecedented high output voltage of 270 mV from a single Li‐TEC. Herein, the wide‐temperature‐range operation demonstrated takes the TECs one step closer to practical applications.